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Boats are docked at the river Nile in front of the burned down headquarters of the National Democratic Party of toppled President Hosni Mubarak in Cairo March 22, 2015. The building, which was burned and gutted during the 2011 uprising, is draped with a banner reading "Investment is the key to Egypt's prosperity." World Water Day is observed on March 22. REUTERS/Amr Abdallah Dalsh